Type-writing-machine cylinder



(No Model.)

W. J. HOLMES. TYPE WRITING MACHINE CYLINDER.

Patented June 1 ...MNM VIJ /nven for UNITED STATES PAT-ENT OEEICE.

IVILLIAM J. HOLMES, OF UTIOA, NEIV YORK.

TYPE-WRITING-MACHINE CYLINDER.

SPECIFICATION forming partof Letters Patent No. 583,804, dated J' une 1,1897.

Application led February ll., 1896. Serial No. 578,875. (ITo model.)

To all whom t ntafy con/cern:

Be it known that I, WILLIAM J. HOLMES, a citizen of the United States,residing at Utica, in the county of Oneida and State of New York, haveinvented certain new and useful Improvements in Cylinders forType-l/Vriting Machines; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enable.others skilled in the art to which it appertains to make and use thesame.

My invention is a cylinder for type-Writing machines; and theobject-that I have in view is the production of a simple, cheap cylinderwhich Will reduce to a minimum the noise due to the impact of the typeagainst the surface of the cylinder.

Experience with a type-Writing machine equipped with a cylinderconstructed in accordance with my invention has demonstrated that thenoise resulting from the operation of the machine is much less than whenthe ordinary types of cylinders are mounted in the machine for the typeto strike against. In short, the new cylinder makes the machinepractically noiseless.

My improved cylinder consists of the cornbination of an imperforatecylindrical rubber printing-surface, a solid cork core whichsubstantially fills the interior space of said cylindricalprinting-surface and forms a noisedeadening medium therefor, and aspindle passing thro ugh and in contact with said cork core.

In the practical application of a cork core to the inside-of an ordinaryrubber cylinder which forms the printing-surface for some types ofWriting-machines provision must be made for the attachment of metallicheads or end pieces and the metallic spindle on which the cylinder is tobe mounted for axial rotation.

One embodiment of my invention contemplates the use of a tube of Wood orother fibrous material between the cork core and the external rubbercylinder and in the provision of a passage extending axially through thecork core, in combination With metallic end pieces or heads which areattached to the fibrous or Wooden cylinder, and a spindle fitted in theaxial opening of the cork core and in bearings in the metallic heads orend pieces of the cylinder.

In another and the preferred embodiment of my invention a metallic tubeis used in lieu of the Wooden tube, Which metallic tube serves toinclose the cork core and is in turn housed Within the rubber cylinder,and the open ends of this metallic tube are closed by Wooden or fibrousplugs which afford a convenient means for holding the screws thatl serveto fasten the metallic heads or end pieces to the cylinder; and theinvention further consists in the construction and combination of partswhich will be hereinafter fully described and claimed.

To enable others to understand my invention, I have illustrated the samein the accompanying drawings, forming a part of this specification, andin Which- Figure l is an elevation of a cylinder embodying myinvention.Fig. 2 is a longitudinal sectional view of the same. Fig. 3 is a detaillperspective View of the cork core detached from the cylinder. Fig. 4 isa longitudinal sectional View through another embodiment of theinvention, in which the core is inclosed Within a metallic tube.

Like letters of reference denote corresponding parts in all the figuresofthe drawings.

In the embodiment of my invention shown by Figs. l to 3, inclusive, itconsists of an eX- ternal rubber cylinder A, which constitutes theprinting-surfacefor the impact of the type, a core of cork B, and a tubeC, which is arranged between the cork core and the rubber cylinder toafford a convenient means for the attachment of the metallic heads orend pieces E F.

The' cylinder A and the heads or end pieces E F are similar in allsubstantial respects to those used on ordinary type-Writing machineswhich employ a movable carriage in Which the cylinder is mounted in aWay to present its surface for the type to strike against, or

against the paper fitted around the cylinder; but the cylinder may beconstructed to bey used in connection With any. other kind oftype-Writing machines.

The core B is made or composed, preferably, of a single piece of cork ofappropriate length and diameter to fit tightly in the tube C, which inturn fits snugly in the rubber cylinder A, and through the cork core isprovided a longitudinal axial openingor passage b for the purpose ofaccommodating the spindle G, on which, in some kinds of type-Writingmachines, the cylinder is to be mounted for IOO axial rotation, andwhich spindle affords a convenient means for the attachment or mountingthe cylinder in the paper-carriage.

The tube C in Figs. 1 and 2 is made of Wood or other fibrous material ofsuch size as to properly fit within the rubber cylinder, and the ends ofthis fibrous tube are exposed to receive the screws e, which are usuallyemployed to fasten the metallic heads to the cylinder, whereby thefibrous tube affords a convenient means for securely attaching the headsor end pieces. One of these metallic heads (the head E) in the ordinaryWell-known type of cylinder is formed with ratchet-teetli on itsperiphery to serve as the feeding-ratchet for turning the cylinder onits axis so as to feed the paper each time the carriage is returned toplace to begin a new line; but the other metallic head or end piece F isa plain disk to close the end of the cylinder against which it isapplied. As is usual, these inetallic end pieces or heads are providedwith integral hollow bosses f, which are in axial' alinement with thepassage b in the cork core, and through the hollowT bosses the spindle Gis passed, so that the metallic bosses serveas bearings by which thecylinder is rotatably mounted on the spindle. These metallic bearingstake up the friction and wear which comes upon the cylinder due to itsrotation when feeding the paper, so that the cork core is not subjectedto any appreciable degree of Vwear and deterioration.

In the embodiment of my invention (illustrated by Fig. 4 of thedrawings) the fibrous tube C is omitted, and in lieu thereof I use ametallic tube H, which serves to inclose the cork core and is itselfinclosed within the rubber cylinder. Vhen the metallic tube H is used, Iprefer to make the cork core of somewhat less length than when it isused in connection with the fibrous tube C, in order to provide spacesin the ends of the metallic tube H to receive the plugs, which afford asecure means for holding the screws or other fastenngs that attach theend pieces or disks E F to the cylinder. Each end of the metallic tube Hmay be'closed by means'of one or more wooden or fibrous plugs I, whichare preferably forced tightly into the open ends of the tube H, upagainst the cork core, and arranged so as to be practically flush withthe ends of said metallic tube. The end pieces or heads, constructedinthe same way as in the ordinary cylinder and as shown by the drawings,are applied against the ends of the rubber cylinder, the metallictube,and the fibrous plugs, and through suitable apertures in the saidmetallic heads are passed the screws, which embed themselves in thefibrous plugs and thus operate to securely fasten the heads or endpieces to the cylinder.

The chief advantage resulting from the use of a cylinder constructed inaccordance with my invention is the comparative freedom from the noisedue to the type striking against the surface of the cylinder, as thecork core offers a cushion for the impact or blow of the type and servesasa noise-deadening medium. Another advantage is the facility by whichthe rubber cylinder A when Worn or played out can be replaced. It Willbe noted that the core, its jacket or inclosing-tube, and the metallicheads are attached or united together, and to replace a worn-outrubbercylinder it is only necessary to remove one of the end pieces or heads,detach the old cylinder, slip the device into Va fresh new cylinder, andagain attach the head to the core.

Having thus fully described myinvention, what I claim as new, and desireto secure by Letters Patent, .is-

1. In acylinder for type-writing machines, the combination ofacylindrical rubber printing-surface, a tube within the same, thenoisedeadening core which fills the space .within said tube and isprovided with an axial opening, fibrous end plugs fitted in the tubeagainst the noise-deadening core, the end bearingpieces attached to thefibrous plugs, and a spindle passing through the bearing-pieces, theplugs, and said core and forming an interior support for the core andcylinder, all

`arranged and combined for service as set forth.

2. In a cylinder for type-writingmachines, the combination of animperforate cylindrical printing-surface,a tube fitted in saidprintingsurface, a noise-deadening core which substantially fills theinterior space of said tube, and a spindle in contact with said core;the spindle being removable from the core, and the tube and core beingremovable bodily from the printing-surface, as and for the purposesdescribed.

3. In a cylinder for type-Writing machines, the combination with aniniperforate cylindrical rubber printing-surface, of a noisedeadeningcore which substantially fills the interior space of saidprinting-surface,fibrous attaching meanswithin said printing-surface,metallic end pieces fastened rigidly to said fibrous attaching means,and a spindle which passes through said metallic end pieces and throughand in contact with the noise-deadening core, as andfor the purposesdescribed.

4:. In a cylinder for type-writing machines, the combination of animperforate, cylindrical, rubber printing-surface, a solid continuouscork core which substantially fills the interior space of saidprinting-surface and forms a noise-deadening medium and a resilientbacking for said printing-surface, and a spindle passing through and incontact with said cork core, as and for the purposes described.

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM J. HOLMES.

Vitnesses:

.T01-IN MCGUIRK, J. GEO. SWERTFAGER.

IOO

IIO

